Granite base soil region distributes widely in drainage area of Dongting lake.It is intrinsic mechanism and the special condition of weather and the relationship between human and land of Dongting lake drainage area that make this type soil region become the most serious soil erosion region

hence bring the worst environmental and social and economical result.In the area of granite

topography is rapidity

weathering is rapidity

the layer of weathering is very deep and the soil is very easy to be eroded away.With inner force and external force acting together

the features of time sequence are relevant with the features of every weathering layer.On the basis of the observation to granite base

the author indicates the soil erosion region of different area and bring forward the time sequence characters of soil erosion and reveal the time and spatial difference of soil erosion.For the valid management

authors first try to classify the regional difference of granite soil erosion in the granite region of wet area

then brings forward the scientific measures in controlling the soil erosion.